... , custom rubber Material: nbr, epdm,silicone... More than 1500 o ring sizes O ring is one of the main products in ... our factory, it is made from Nitrile(NBR), HNBR ,EPDM, Silicone ... , Fluorine(FKM,FPM), Neoprene(CR),Styrene(SBR) ,CR,ACM,PU etc.Application: O ring is widely used ... to customer in the exact performance. Clear silicone ring